Fancy My Stepson

I got together with his dad when he was 16 and within a few times of meeting him I couldn't help myself fancying him a bit and it's just got worse over the months. Now I think I stay with his dad so I can still be in the same house as him. I don't know whether my relationship with his dad will survive him going to University in a few weeks, which is so messed up.

We've been drunk together a few times and had the mildest of mild flirts, but they were firmly tongue in cheek - although my body was on fire and I couldn't think straight afterwards for butterflies. He could have kissed me then, in the pub in front of everyone and I don't think I'd have cared about the scandal.

I almost made a move once - I was outside his door in my sexy knickers- we were alone in the house for the night and it was the perfect time, but I chickened out as I couldn't bear to risk what I had.

What do I do? Do I tell him? It's really bad but I want him to make the first move so I can control what happens and when, but if I wait for too long he'll be at university...